Random network (gateway) disconnect

Have one user that just started getting disconnected from the internet once or twice a day. While disconnected the computer can access the server along with pinging it but can't ping the gateway. No one else is having the disconnect.
I have changed the network cable on the pc side and the switch side and also changed the port that the computer plugs into.
I have ipconfig /release, /flushdns, /registerdns
There is no event log from the time period that this happens.
My only other option to test is to install a new NIC card and see if it happens on that.
calitechAsked:
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DLeaverCommented:
What is the model of your router?

Try the following from an elevated command line

cd\

netsh int ip reset reset.log

Then restart the PC
Robert SchuttSoftware EngineerCommented:
We've seen this at our company. I'm not a system or network engineer but thought I might share: we compared 2 computers' settings and found that the network card driver (RealTEK) had been updated and on the system that didn't have the problem, it was not. So we did a rollback of the driver and it was solved.

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masnrockCommented:
Reset the TCP/IP stack as Dleaver already mentioned. Also check the power management settings on the NIC card. Any patterns to when they are getting disconnected?
calitechAuthor Commented:
I did the reset IP stack and also the NIC did have a power management setting enabled so I disabled it. I will wait to see what happens today or tomorrow with the user.
calitechAuthor Commented:
did everything and also updated the driver instead of rolling it back and no more disconnects.
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